SoA, you are still thinking only from your pain and hurt. Try to put yourself for a moment in his pain and hurt. Can you see how a letter like this would just piss you off? It's very self-serving. It's all I..I...I...I. Do not send anything like it.
I'm not going to tell you not to write at all(this time) because he opened the door to you just a crack. You just need to be very careful not to get it slammed back in your face.
Try something like this: I know that I caused you unbearable pain and for that I am deeply sorry. I do not say this to help myself but only for you to hear it. It's impossible to know if we can make a way through all this hurt and pain to find a new path together. All I do know is that I would like the chance to try. Given time, I only hope that you might take that chance too.
